The Washington Naval Conference was held in Washington D.C. for four months discussing and making treaties following the World War I. One of the most important treaties made was the Five-Power Naval Limitation Treaty. This treaty limited the arms of five countries: United States, Great Britain, Japan, France and Italy. This treaty is to prevent mass production of arms following the World War I. The limitations reflected on the tonnage of ships and aircraft carriers each country can have. This treaty was made in hopes of preventing a second world war.